I have a 13-year-old intellectually disabled boy. He exposes his private parts in front of my neighbor. What do I do?

If he does it by accident, it suggests his clothes might be uncomfortable, so he removes them (for example, maybe he hates jeans or gets hot). If it seems to be on purpose, this suggests that he feels starved for attention. Try giving him more positive attention in other contexts, and encouraging him to communicate his needs better. How to Make a Behavior Intervention Plan for an Autistic Child may help you teach him to get attention in better ways (even if he is not autistic). Consider talking to a therapist or social worker for more help.